// Copyright 2013 Petar Maymounkov
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package trace

import (
	"fmt"
	"sync"
)

var (
	tlk sync.Mutex
	tkt uint32
)

func TakeTicket() string {
	tlk.Lock()
	defer tlk.Unlock()
	tkt++
	return fmt.Sprintf("TKT:%-2d", tkt)
}
